<template>
  <div class="my-product">
    <h3>标题:{{title}}</h3>
   <p>价格:{{value}}</p>
    <button @click="value">点我</button>
  </div>
</template>

<script> 

export default {
 props:['title','value'],

 methods: {
  kan() {
    this.$emit('input',this.value -2)
  }
 }
}

</script>

<style>
.my-product {
  width: 400px;
  padding: 20px;
  border: 2px solid #000;
  border-radius: 5px;
  margin: 10px;
}
</style>